问题
选择题
He is believed____________ in at his office on his way home.
A．dropping
B．to have dropped
C．having dropped
D．to be dropped
答案
答案：B
首先be belived to do是固定用法；drop in at接地点表示拜访某地。
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He is believed____________ in at his office on his way home.
A．dropping
B．to have dropped
C．having dropped
D．to be dropped
答案：B
首先be belived to do是固定用法；drop in at接地点表示拜访某地。